Cable-armor.



H. R. GILSUN.

CABLE AHMOR.

M'l'i ILAHON HLU) AUG. 1

IYHI.

Patented Apr. 6, 1915.

INVENTOR WITNESSES UNITED nae Pa 1 2-:

' i E. GEESON, OF BEAVER, PENNSYLVANIA, ASSIGNOR T0 NATIONAL TAX:

HOLDING COMIPANY, A COOTIOW OF PENNSYLVANIA.

EMILE-OE.

specification of Letters Patent.

Patented Apr. 8, 19115.

Application filed August 14, 1911. serial No. 048,938.

T 0 all whom it may concern:

Be it known that I, HENRY R. GILSON, residing at Beaver, in the county of Beaver and State of Pennsylvania, a citizen of the nited States, have invented or discovered a certain new and useful Improvement in Cable-Armor, of which improvement the following is a specification.

The invention relates to kind of cable armor or conduit which is formed by helically coiling a strip or strips of metal in such manner that the individual coils are capable of a limited .relative movement, so that the product'may be bent to suit conditions of use. A common form of such armor or conduit has been made of two strips of metal, bent to a U-shaped crosssection, one strip being coiled with its edges turned outwardly, and the other coiled thereon with its edges turned inwardly and arranged between the edges of the inner strip. In the strips heretofore thus employed, either the edge has been bent at right angles to the body portion of the strip, or the entire cross-section of the strip has been given a curved form approximating an arc ofa circle. It is the object of the present invention to provide an improved armor or conduit of the general type above men-' tioned, which is economically manufactured, durable in use, and may be readily bent to any degree required by conditions 'of use without serious strain.

In the accompanyin drawings Figure 1 is a view of a piece'o cable inclosed in an armor or conduit embodying the invention, a portion thereof being shown in section. Fig. 2 is a cross-section of one of the metallic strips.

Each of the strips 1 and 2 has a fiat body portion 3, and its opposite edges 4 bent at an angle less than a right angle to the plane of sai body portion. This orm of stri I have found by experimentto be a deci ed that class or improvement. It may be much more easily formed than in the case where the ed es are bent at right angles to the body, an there is a minimum'of binding in the finished product to cause strain in bending the latter. As compared with the arc-shaped strip, the product of the present invention has a smoother surface, both inside and outside, and the strips are more firmly nested together. 7

The armor or conduit may be manufactured by any suitable means in the manner already indicated, namely, by helically coiling the inner strip 1 with its edges 4 turned outwardly, and the outer strip 1 with its edges turned inwardly between the edges of the inner strip, A filling strip 5 of pa r or other yielding material is prefera ly coiled within the edges of the innerstrip, and the edges of the outer strip rest thereon, as shownin Fig. 1. The strips may be coiled directly upon thecable, or they may be formed into a tubular structure and the cable or other conductors be threaded therethrough.

ll claim herein as my invention:

A cable armor formed of inner and outer metallic strips arranged in superposed helical coils, each strip consisting solely of a flat body portion and a fiat continuous interlocking portion formed integrally with and immediately adjoining each edge of said body portion and extending the ull length thereof, said interloch'ng portions being small in width as compared to said body portion and inclined at less than a right angle thereto.

In testimony whereof l have hereunto set my hand.

WM C. Roamsoa, man A. C'rr. 

